How to store address of BST node in a queue?

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C

structure

Quote:

Warning: makes integer from pointer without a cast:
Note->Bstnode is a node of binary tree amp is structure of queue

Is this error that I am getting is due to amp->array[amp->rear]=root; because root is a pointer If then what will be the way if I want to store the address of struct Bstnode that is the address of nodes of BST in a queue. Please give a pointer to my error

What I have tried:

void enqueue(struct queue* amp,struct Bstnode* root){
    if(isfull(amp))
       return;
    else if(isempty(amp))
    {
       amp->rear=0;
       amp->front=0;
       amp->array[amp->rear]=root;
    }
    else
    {
        amp->rear=((amp->rear+1)%(amp->capacity));
        amp->array[amp->rear]=root;
    }

}